I could bore you could bore she could bore we could bore you could bore they could bore
V-ing form
I could be boring you could be boring she could be boring we could be boring you could be boring they could be boring
Perfect
I could have bored you could have bored she could have bored we could have bored you could have bored they could have bored
V-ing perfect
I could have been boring you could have been boring she could have been boring we could have been boring you could have been boring they could have been boring
Negation
Simple form
I could not bore you could not bore she could not bore we could not bore you could not bore they could not bore
V-ing form
I could not be boring you could not be boring she could not be boring we could not be boring you could not be boring they could not be boring
Perfect
I could not have bored you could not have bored she could not have bored we could not have bored you could not have bored they could not have bored
V-ing perfect
I could not have been boring you could not have been boring she could not have been boring we could not have been boring you could not have been boring they could not have been boring
Interrogative form
Simple form
could I bore? could you bore? could she bore? could we bore? could you bore? could they bore?
V-ing form
could I be boring? could you be boring? could she be boring? could we be boring? could you be boring? could they be boring?
Perfect
could I have bored? could you have bored? could she have bored? could we have bored? could you have bored? could they have bored?
V-ing perfect
could I have been boring? could you have been boring? could she have been boring? could we have been boring? could you have been boring? could they have been boring?
Interro-negative form
Simple form
could I not bore? could you not bore? could she not bore? could we not bore? could you not bore? could they not bore?
V-ing form
could I not be boring? could you not be boring? could she not be boring? could we not be boring? could you not be boring? could they not be boring?
Perfect
could I not have bored? could you not have bored? could she not have bored? could we not have bored? could you not have bored? could they not have bored?
V-ing perfect
could I not have been boring? could you not have been boring? could she not have been boring? could we not have been boring? could you not have been boring? could they not have been boring?